[llvm] Limit Number of Values used for SCEV Calculation (PR #140565)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

The problem with implementing a limit the way you've done it is that it leads to weird behavior: when you hit the limit, the "limited" result ends up in the SCEV cache.  So anything that was calculated is permanently "unknown", which is likely to confuse future calculations.

ScalarEvolution::createSCEVIter tries pretty hard to avoid doing anything recursively; maybe it can be fixed for your specific case?

https://github.com/llvm/llvm-project/pull/140565